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variable: $wcrv -- sulc error force sphere_morph()
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default: 0.5

The floating point parameter, $wcrv ("weight of
curv error"), (F3 panel, lower left) controls the
strength of the tangential 'force' in
sphere_morph() that tries to reduce curvature
error between moveable surface and target
(curvature data is typically "sulc" data set,
which indicates sulcal depth).

Turning this up produces better alignment at the
cost of more distorted surfaces.

See R-click help for "REG" for more details.
